CVE-2024-7331Public exploitNetwork attack vector

Authenticated memory corruption via oversized module upload

Published Aug 1, 2024 · Updated Aug 1, 2024

Buffer overflow in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to corrupt memory via a crafted module upload. The UploadCustomModule function in /cgi-bin/cstecgi.cgi processes attacker-controlled File data without enforcing the destination buffer's size. Access to the router management interface and low privileges are required; the public record establishes memory corruption but demonstrates no specific crash, code-execution, or data-access outcome.

CVSS severity8.8
High
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to corrupt memory via a crafted module upload. The UploadCustomModule function in /cgi-bin/cstecgi.cgi processes attacker-controlled File data without enforcing the destination buffer's size. Access to the router management interface and low privileges are required; the public record establishes memory corruption but demonstrates no specific crash, code-execution, or data-access outcome.

The record

CVE
CVE-2024-7331
Published
Aug 1, 2024
Updated
Aug 1, 2024
Vendor
TOTOLINK
Product
A3300R
Classifications
CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.0.0cu.557_b20221024
  2. Affected versionversion=17.0.0cu.557_B20221024

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

TOTOLINK · A3300Rversion=17.0.0cu.557_b20221024; version=17.0.0cu.557_B20221024

Published CVSS scores

9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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